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<p>In wireless charging systems for electric vehicles (EVs), passive coil electromagnetic sensing technology has emerged as the preferred method for metal object detection (MOD) due to its high reliability. However, traditional detection methods based on auxiliary coils suffer from detection blind spots and insufficient sensitivity. To address these limitations, this study proposes a MOD detection coil (DX) composed of six symmetrically arranged detection subcoils, each featuring a variable zigzag configuration. By analyzing the influence of metal object (MO) positions on self-inductance under varying coil dimensions, the optimal design parameters for the DX were determined. An experimental platform was subsequently constructed to validate the design. Results demonstrated that when an MO intrudes into noncentral regions, the differential voltage of the corresponding subcoil remarkably increases. Moreover, when the intrusion occurs in the central blind zone, the differential voltages of all six subcoils exceed the predefined threshold. The experimental findings conclusively validate that the proposed DX achieves high-sensitivity, blind-spot-free detection.</p>

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Design of a nonblind-spot detection system for metal objects in wireless charging of electric vehicles

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Qingye Han,
  • Hao Qiang,
  • Zhitong Chen,
  • Haojie Huang,
  • Jianbo Wang

摘要

In wireless charging systems for electric vehicles (EVs), passive coil electromagnetic sensing technology has emerged as the preferred method for metal object detection (MOD) due to its high reliability. However, traditional detection methods based on auxiliary coils suffer from detection blind spots and insufficient sensitivity. To address these limitations, this study proposes a MOD detection coil (DX) composed of six symmetrically arranged detection subcoils, each featuring a variable zigzag configuration. By analyzing the influence of metal object (MO) positions on self-inductance under varying coil dimensions, the optimal design parameters for the DX were determined. An experimental platform was subsequently constructed to validate the design. Results demonstrated that when an MO intrudes into noncentral regions, the differential voltage of the corresponding subcoil remarkably increases. Moreover, when the intrusion occurs in the central blind zone, the differential voltages of all six subcoils exceed the predefined threshold. The experimental findings conclusively validate that the proposed DX achieves high-sensitivity, blind-spot-free detection.